<template>
    <div class="goodsinfo-container">
        <!-- 小球动画 -->
        <transition @before-enter="beforeEnter" @enter="enter" @after-enter="afterEnter">
            <div class="ball" v-show="ballFlag" ref="ball"></div>
        </transition>

        <!-- 商品轮播图区域 -->
        <div class="mui-card">
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <swiper :lunbotuList="lunbotu" :isfull="false"></swiper>
                </div>
            </div>
        </div>

        <!-- 商品购买区域 -->
        <div class="mui-card">
            <div class="mui-card-header">{{ goodsinfo.title }}</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p class="price">
                        市场价：<del>{{ goodsinfo.market_price}}</del>&nbsp;&nbsp;
                        销售价：<span class="now_price">{{ goodsinfo.sell_price }}</span>
                    </p>
                    <p>购买数量：
                        <numbox @getcount="getSelectdCount" :max="goodsinfo.stock_quantity"></numbox>
                    </p>
                    <p>
                        <mt-button type="primary" size="small">立即购买</mt-button>
                        <mt-button type="danger" size="small" @click="addToShopCar">加入购物车</mt-button>
                    </p>
                </div>
            </div>
        </div>

        <!-- 商品参数区域 -->
        <div class="mui-card">
            <div class="mui-card-header">商品参数</div>
            <div class="mui-card-content">
                <div class="mui-card-content-inner">
                    <p>商品货号：{{ goodsinfo.goods_no}}</p>
                    <p>库存情况：{{ goodsinfo.stock_quantity }}件</p>
                    <p>上架时间：{{ goodsinfo.add_time | dateFormat }}</p>
                </div>
            </div>
            <div class="mui-card-footer">
                <mt-button type="primary" size="large" plain @click="goDesc(id)">图文介绍</mt-button>
                <mt-button type="danger" size="large" plain @click="goComment(id)">商品评论</mt-button>
            </div>
        </div>
    </div>
</template>

<script>
// 导入轮播图组件
import swiper from '../subcomponents/swiper.vue'
import { Toast } from 'mint-ui'
// 导入数字选择框组件
import numbox from '../subcomponents/goodsinfo_numbox.vue'

export default {
    data() {
        return {
           id: this.$route.params.id,
           lunbotu: [],
           goodsinfo: {},
           ballFlag: false,             // 控制小球显示和隐藏的标识符
           selectedCount: 1,            // 购买数量
        }
    },
    methods: {
        // 获取轮播图数据
        getLunbotu(){
            this.$http.get("api/getthumimages/" + this.id).then(result => {
                console.log("获取轮播图数据：")
                if (result.body.status === 0) {
                    // 循环每个数据，添加img属性
                    result.body.message.forEach(item => {
                        item.img = item.src
                    });
                    this.lunbotu = result.body.message
                    console.log(this.lunbotu)
                } else {
                    Toast("获取数据失败!")
                }
            })
        },
        // 获取商品参数
        getGoodsInfo(){
            this.$http.get("api/goods/getinfo/" + this.id).then(result => {
                console.log("获取商品参数：")
                if (result.body.status === 0) {
                    this.goodsinfo = result.body.message[0]
                    console.log(this.goodsinfo)
                } else {
                    Toast("获取数据失败!")
                }
            })
        },

        goDesc(id){
            this.$router.push({ name: "goodsdesc", params: { id } })
        },

        goComment(id){
            this.$router.push({ name: "goodscomment", params: { id } })
        },

        addToShopCar(){
            this.ballFlag = !this.ballFlag
            // 生成商品对象，保存到store.state.car数组
            var goodsInfo = { 
                id: this.id, 
                count: this.selectedCount, 
                price: this.goodsinfo.sell_price, 
                selected: true
            }
            // 调用 store 中的 mutatuons 将商品添加到 car 数组
            this.$store.commit("addToCar", goodsInfo)
        },

        beforeEnter(el){
            el.style.transform = "translate(0, 0)";
        },
        enter(el, done){
            el.offsetWidth;
            // 获取小球在页面中的位置
            const ballPosition = this.$refs.ball.getBoundingClientRect()
            console.log(ballPosition)
            // 获取购物车徽标的位置
            const badgePostion = this.$root.$children[0].$refs.shopcart.getBoundingClientRect()
            // const badgePostion = document.getElementById("badge").getBoundingClientRect()
            console.log(badgePostion)

            const xDist = badgePostion.left - ballPosition.left;
            const yDist = badgePostion.top - ballPosition.top;
            console.log(xDist + '*' + yDist)

            el.style.transform = `translate(${xDist}px, ${yDist}px)`;
            el.style.transition = "all 0.5s cubic-bezier(.17,.67,.83,.67)";
            done();
        },
        afterEnter(el){
            this.ballFlag = !this.ballFlag
        },

        getSelectdCount(count){
            // 当子组件传递选中的值传递过来时，保存到父组件的data中
            this.selectedCount = count;
            console.log("父组件的值: " + this.selectedCount)
        }
    },
    created() {
        this.getLunbotu();
        this.getGoodsInfo();
    },
    components: {
        swiper,
        numbox
    }
}
</script>


<style lang="scss" scoped>
    .goodsinfo-container{
        background-color: #eee;
        overflow: hidden;

        .now_price{
            color: red;
            font-size: 16px;
            font-weight: bold;
        }

        .mui-card-footer{
            display: block;

            button{
                margin: 15px 0;
            }
        }

        .ball{
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background-color: red;
            position: absolute;
            z-index: 99;
            top: 410px;
            left: 150px;
        }
    }
</style>
